I am afraid you are out of luck. A bit of history here. Many moons ago there was a spat at Zarafa and an number of developers moved out, forked it and created Kopano. They co-existed for a while until Zafara admitted defeat and folded into Kopano. There have been no updates to Zarafa for many moons and there never will be. We keep offering the app because it is next to impossible to automate a conversion to Kopano and then there would be licensing problem. The conversion can be done manually (fairly easily) if the user is then prepared to pay resulting the licensing costs going forward.